Reolink is showing an all-new video doorbell at IFA this week. The Reolink Battery Doorbell might have a boring name, but its specs will be of interest to anyone looking for a new porch sentinel, starting with its 4-megapixel image sensor and 2048 x 2048-pixel resolution that delivers head-to-toe views of visitors. This news story is part of TechHive’s in-depth coverage of the best video doorbells. The new doorbell has a 7,000mAh battery onboard, but it can also be powered by low-voltage wiring—8-24V AC , 24V DC—if you’re replacing an existing doorbell. Reolink’s device can alert you when pack…